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Scalability of self-adaptive Cooperative enhanced Scatter Search (saCeSS) using 1, 10, 20 and 40 processors in problem B2. Note that the saCeSS method using 1 MPI process is equivalent to the eSS method using 1 processor. For each method, the convergence curves that are closer to the median of the results distribution are shown in the figure. Detailed distributions for all the benchmarks can be found in Additional file 1
